Sildenafil has been shown to aggravate sleep-disordered breathing in patients with severe obstructive sleep apnea. The aim of the present study is to examine the frequency of sleep-disordered breathing in obese patients who are candidates for treatment with sildenafil for sexual dysfunction. In addition we wish to assess the effect of sildenafil on sleep-disordered breathing.

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Please refer to this study by its ClinicalTrials.gov identifier: NCT00893191